Awesome thing with a bunch of important definitions! Read this first so you understand the following stuff. That site has tons of great resources, mostly aimed at autistics, but excellent for others to read as well.
Slightly scholarly and dense short essay about What Is Autism.
Autistic people usually have at least some sensory issues. Here is general info about Sensory Processing Disorder and here are sensory-overwhelm coping things!
Giant Masterpost about how terrible autism speaks is, with lots of good links and such!
Here is a thing about making one’s habitat more autistic friendly.
Cool graphic about executive function, which is something almost all autistics have trouble with.
Behavior/Aggression issues and their causes.
A lot of autistics benefit form stim toys (aka fidget toys). Some great places to get fidget are Stimtastic, Office Playground, Fidget Land, and ChewiGem. Ebay and Amazon usually have cool stuff too!
Feel free to add more links! If there is a problem with one of these thinks or there is bad info/ableism I didn’t catch, please let me know!